Marion is a city located in South Dakota. With a 2020 population of 786, it is the 78th largest city in South Dakota and the 11358th largest city in the United States. Marion is currently growing at a rate of 0.13% annually and its population has increased by 0.26% since the most recent census, which recorded a population of 784 in 2010. Spanning over 1 miles, Marion has a population density of 906 people per square mile.
The average household income in Marion is $54,318 with a poverty rate of 16.94%. The median rental costs in recent years comes to $677 per month, and the median house value is $79,100. The median age in Marion is 50 years, 49.2 years for males, and 53.1 years for females. For every 100 females there are 84.5 males.